package com.springcloud.netflix_zuul.filter;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;

/**
 * @author hw
 * <p>
 * Zuul的过滤器实现
 * 	    返回一个字符串代表过滤器的类型，pre：路由之前,routing：路由之时,post： 路由之后,error：发送错误调用
 * </p>
 */
@Component
public class CommonFilter extends ZuulFilter {
	private static Logger log = LoggerFactory.getLogger(CommonFilter.class);

	    @Override
	    public String filterType() {
	        return "pre";
	    }

	    /**
	      过滤的顺序
	   */
	    @Override
	    public int filterOrder() {
	        return 0;
	    }

	    /**
	      这里可以写逻辑判断，是否要过滤，本文true,永远过滤。
	    */
	    @Override
	    public boolean shouldFilter() {
	        return true;
	    }

	    /**
	      过滤器的具体逻辑。
	   */
	    @Override
	    public Object run() throws ZuulException {
	        RequestContext ctx = RequestContext.getCurrentContext();
	        HttpServletRequest request = ctx.getRequest();
	        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
	        Object accessToken = request.getParameter("token");
	        if(accessToken == null) {
	            log.warn("token is empty");
	            ctx.setSendZuulResponse(false);
	            ctx.setResponseStatusCode(401);
	            try {
	                ctx.getResponse().getWriter().write("token is empty");
	            }catch (Exception e){}
	            return null;
	        }
	        log.info("ok");
	        return null;
	    }
}

